Surah At-Tawba · سُوْرَةُ التَّوْبَةِ · Juz 10
Q 9:42
لَوْ كَانَ عَرَضًا قَرِيبًا وَسَفَرًا قَاصِدًا لَّٱتَّبَعُوكَ وَلَـٰكِنۢ بَعُدَتْ عَلَيْهِمُ ٱلشُّقَّةُ ۚ وَسَيَحْلِفُونَ بِٱللَّهِ لَوِ ٱسْتَطَعْنَا لَخَرَجْنَا مَعَكُمْ يُهْلِكُونَ أَنفُسَهُمْ وَٱللَّهُ يَعْلَمُ إِنَّهُمْ لَكَـٰذِبُونَ
Translations
Had it been an easy gain and a moderate trip, the hypocrites would have followed you, but distant to them was the journey. And they will swear by Allah, "If we were able, we would have gone forth with you," destroying themselves [through false oaths], and Allah knows that indeed they are liars.S'il s'était agi d'un profit facile ou d'un court voyage, ils t'auraient suivi; mais la distance leur parut longue. Et ils jureront par Allah: «Si nous avions pu, nous serions sortis en votre compagnie.» Ils se perdent eux-mêmes. Et Allah sait bien qu'ils mentent.Tafsir
If the Prophet had called the hypocrites who asked for permission to stay behind to an easy reward and a journey that was not difficult, they would have followed him; but the distance he called them to cover to get to the enemy was too great for them, so they stayed behind. These hypocrites who asked for permission to stay behind would swear by Allah when the Prophet returned to them, saying that if they could have gone out to fight with them they would have done so. They destroy themselves by exposing themselves to Allah’s punishment, because they stayed behind and then swore a lie. Of course, Allah knew they were lying in what they claimed and in what they swore.
Read Ibn Kathir (Ibn Kathir (abridged, English))
Arabic text: Tanzil (Uthmani). Translations: Sahih International (en), Muhammad Hamidullah (fr). tanzil.net